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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dcdd3bbf32d93deeee2032f60782e9ae4325bd9c0d4533d9aa6c0258814fa374' 
  AND token = 'JaP2f1SVARZu+GIpkD/F3FsjilWmeLaopig7fzvx5CQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}